get_model_for_table returns model which can not return create table SQL

[nnseva]

I supposed that the following code should get create table SQL into the s2 variable, but it raises the exception instead.

In [1]: from infi import clickhouse_orm as orm
In [2]: from utils.chdb import chdb
In [3]: db = chdb()
In [4]: class TestModel(orm.Model):
   ...:     source = orm.StringField()
   ...:     created_at_date = orm.DateField(default=orm.F.today())
   ...:     engine = orm.MergeTree(partition_key=('created_at_date',),order_by=('source',))
   ...: 
In [5]: db.create_table(TestModel)
In [6]: s1 = TestModel.create_table_sql(db)
In [7]: TestModelAdHoc = db.get_model_for_table(TestModel.table_name())
In [8]: s2 = TestModelAdHoc.create_table_sql(db)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[8], line 1
----> 1 s2 = TestModelAdHoc.create_table_sql(db)

File ~/py.3.11.transitflow/lib/python3.11/site-packages/infi/clickhouse_orm/models.py:369, in Model.create_table_sql(cls, db)
    367 # Engine
    368 parts.append(')')
--> 369 parts.append('ENGINE = ' + cls.engine.create_table_sql(db))
    370 return '\n'.join(parts)

AttributeError: 'NoneType' object has no attribute 'create_table_sql'

A reason probably that the get_model_for_table() method doesn't analize and store the table engine definition in the returned AdHoc model.

[remark for the sample code: the chdb() call returns the current Database instance]